Thanks for all the help. I believe you're right with the hydraulic suspension. I stopped by the dealer and bought a quart for $15. It looks like it only filled half the reservoir, though. It was completely empty. How much of that stuff do I have to fill the reservoir? does it need to be filled to the top? I might have to buy another quart. Darn, that stuff is expensive. I wish I can get a generic one. I didn't find that stuff in Fastlane.